This happens whenever the terminal point of
Meanwhile,
since you already know sine is positive. Cosine is positive when the angle lies in the first or fourth quadrant.
Sine and cosine are both positive only when
Cho tam giác DEF vuông tại D, đường cao DI. Biết , DE = 18 cm . Giải tam giác DEF và tính độ dài DI.
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This happens whenever the terminal point of
Meanwhile,
since you already know sine is positive. Cosine is positive when the angle lies in the first or fourth quadrant.
Sine and cosine are both positive only when